两种不同类型的角色实体？
显然，HTML/XML 中有两种不同类型的字符实体。
有由数字指定的，即 < 和 >
还有由字母指定的，>< 和 >
这些类型的字符实体是否都有特定的名称，或者它们只是“由数字和字符实体指定的字符实体”是用字母指定的吗？
Clearly there are two different types of character entities in HTML/XML.
There are the ones that are specified by numbers, i.e. < and >
And then there are the ones that are specified by letters, < and >
Is there a specific name for each of these types of character entities, or are they just "character entities that are specified by numbers and character entities that are specified by letters?
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它们是数字字符引用 (
<) 和< a href="http://www.w3.org/TR/html4/sgml/entities.html#h-24.2" rel="nofollow">字符实体 (<）。字符实体定义为字符引用序列 - 例如，
nbsp定义为处理时，字符实体将转换为相应的字符引用。
顺便说一句 - 字符实体可以定义为多个字符引用，尽管 XML 或 HTML 中还没有这样做。
These are numeric character references (
<) and character entities (<).Character entities are defined as a sequence of character references - for instance,
nbspis defined asWhen processed, character entities are converted to the corresponding character references.
By the way - a character entity can be defined as more than one character reference, though this has not been done in XML or HTML.